
if ARGV.size < 1
	puts "lower file1 [file2 [...]]"
	exit
end

i = 0
while i < ARGV.size
	if File.exist?(ARGV[i])
		File.rename(ARGV[i], ARGV[i].downcase)
	elsif
		puts "File [" + ARGV[0] + "] does not exist."
	end
	i = i + 1
end